h1{
    width:400px;
    height:100px;
    padding:50px;
    margin: 50px;
    border:1px solid #ffccdd;
}

span{
    width: 400px;
    height: 100px;
    padding:10px;
    margin:10px;
    border:1px solid #00dddd;
}
/*内联的盒子不会换行*/
/*div{
    display:inline;
}*/
/* 换行 */
a{
    display:block;
    width:100px;
    height: 100px;
}

a{
    display:inline-block;
    width: 200px;
    height: 100px;
    border: 1px solid #cfcfcf;
}
a:hover{
    background-color: #00c;
}
div.box_before{
    width: 350px;
    height: 30px;
    background-color:chartreuse;
}
div.box{
    box-sizing: border-box;
    width: 350px;
    height: 150px;
    margin:25px;
    padding:25px;
    border:5px solid black;
}
div.box_after{
    width: 350px;
    height:30px;
    background-color: chartreuse;
}

div.box_outline{
    width: 500px;
    height: 300px;
    border: 2px solid blue;
}
/* auto根据内容来定 */
div.box_size{
    width:50%;
    min-width: 300px;
    height:auto;
    max-height: 100px;
    background-color: crimson;
}

div.box_margin{
    width:300px;
    height:100px;
    /*margin:20px;*/
    margin:10px 20px 5px 5px;/*上右下左*/
    /*margin-top:50px;
    margin-left:28px;*/
   /* margin:0 auto;/*水平居中*/
   margin-bottom: 50px;
    background-color: darkorange;
}

div.box_margin2{
    width: 300px;
    height: 100px;
    margin-top: -40px;
    background-color: darkseagreen;
}

div.box_outline p{
    margin: left 30px;
    width: 100px;
    height: 30px;
    border-left: 5px solid gold;
    border-top:1px solid gold;
    border-bottom:1px solid gold;
    border-right:1px solid gold;
    padding-left: 5px;
    padding-top:5px;
}

div.box_outline p:hover{
    border-left:5px solid coral;
}
